Chair-adjustment device



FIG. 1 is a first perspective view of a chair-adjustment device showing the new design;

FIG. 2 is a rear side elevational view thereof;

FIG. 3 is front side elevational view thereof;

FIG. 4 is left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is top plan view thereof;

FIG. 7 is bottom plan view thereof;

FIG. 8 is a second perspective view thereof;

FIG. 9 is a third perspective view thereof;

FIG. 10 is a fourth perspective view thereof; and,

FIG. 11 is a fifth perspective view thereof.

Broken lines are included for the purpose of illustrating portions of the chair-adjustment device and/or environmental structure that form no part of the claimed design. 

CLAIM The ornamental design for a chair-adjustment device, as shown and described. 